Detection head

Details Detection head Detection head

2007-07-06

2009-11-24

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S239000, C250S551000

Reexamination Certificate

active

07622698

ABSTRACT:
A reflective sensor is disclosed which prevents divergent light from a light source from being totally reflected by an interface between the package and the outside thereof and entering a light-receiving element without using a light-shield means and which allows an improved S/N ratio and reduced variations in performance. The reflective sensor includes a light-emitting element and a light-receiving element which are provided on a surface, and a light-transmissive member which covers the light-emitting element and the light-receiving element. The light-receiving element includes a light-receiving region which is spaced from the light-emitting element along the surface, and which light-receiving region is closer to the light-emitting element than an area on the surface that would be illuminated by unimpeded light rays which are totally reflected by an interface between the light-transmissive member and the outside thereof and are directed toward the light-receiving element.

REFERENCES:
patent: 6454467 (2002-09-01), Ishihara et al.
patent: 7022974 (2006-04-01), Igaki et al.
patent: 7026654 (2006-04-01), Igaki et al.
patent: 7045770 (2006-05-01), Igaki et al.
patent: 2003/0002826 (2003-01-01), Cohen et al.
patent: 62-76684 (1987-04-01), None
patent: 2003-337052 (2003-11-01), None
patent: 2004-006753 (2004-01-01), None
Chinese Office Action in Chinese Application No. 2007-101370129 dated Dec. 5, 2008.

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